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Re: What is the larger of the 2 solutions of the equation x^2 − 4x = 96 ? [#permalink]

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12 Jun 2017, 18:59

The solution should be one of the roots of x^2−4x−96=0

Working from the answer choices, we can work backwards to see if we get an integer quotient by dividing 96 by the answer choice and then checking if we can get a -4 as the difference between the quotient and the answer choice.

Only B fits the scenarios as 96/12 = 8 and 12-8 is 4.

Re: What is the larger of the 2 solutions of the equation x^2 − 4x = 96 ? [#permalink]

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31 Oct 2017, 23:50

I have a question here. So in the equation given : x^2 - 4x =96 then x(x-4)=96 therefore x=96 or x-4=96 x=100 I know for the fact that this method is incorrect. But am not understanding why is it incorrect. can someone please help me